How to solve the problem of mechanical air fryer heating function failure

During the operation of mechanical air fryers, the failure of the heating function usually stems from several key factors, among which the failure of the electric heating tube is one of the most common reasons. As a heating element, the electric heating tube usually adopts a U-shaped or straight bar design, and the structure consists of a resistance wire, an insulating material and a metal shell. High-frequency use or unqualified electric heating tube materials will cause the resistance wire to break or age due to high-temperature fatigue, which will cause the electric heating tube to be short-circuited. In order to confirm the fault, it is necessary to use professional tools such as a multimeter to measure the resistance at both ends of the electric heating tube. If the measured resistance value is infinite, it indicates an internal short circuit and the entire electric heating tube must be replaced. At the same time, if there is an obvious bulge, discoloration or scorch mark on the surface of the electric heating tube, it should also be regarded as a damage signal, and it is recommended to stop using it immediately. When repairing, the electric heating tube that matches the power and voltage of the original model should be selected to ensure that the performance of the equipment is stable and the thermal efficiency meets the standard.

Damage to the thermostat is also another important factor that causes the failure of the heating function. Mechanical air fryers are usually equipped with bimetallic thermostats or temperature fuses to achieve heating control and over-temperature protection. When the internal mechanism of the thermostat fails or the contacts are burned, the heating function will not start or the heat will be automatically cut off in the middle. During the process of heating and bending, the bimetallic thermostat may not work properly due to fatigue, oxidation or mechanical jamming. The equipment needs to be disassembled to detect its thermal response and check whether the contacts are conductive. When replacing the thermostat, the set temperature range and current capacity must be strictly matched. Improper use of the thermostat may cause problems such as inaccurate temperature control or frequent tripping. In addition, the disposable temperature fuse will melt when the set temperature is exceeded. It is an irreversible protection device. If it is found to be disconnected, the same type of component must be replaced. Do not short-circuit to avoid safety hazards.

Abnormal power supply is also an important reason for the failure of the heating function. Damaged power cord, loose plug, loose or burned internal wiring, etc. may cause the heating circuit to fail to close. Especially at the wire connection point between the heater and the thermostat, the contact resistance often increases due to long-term operation, which leads to local overheating, melting of the plastic insulation layer and even short circuit. At this time, the outer shell needs to be disassembled, and each node of the heating circuit needs to be checked one by one according to the circuit diagram to ensure that all joints are firm and free of oxidation, and that there is no cold solder joint. If necessary, replace the aged wire or re-weld it. For mechanical control structures, the heating start signal is usually released through a knob switch. If the knob and the contact point are severely worn or the internal dial is deformed, the signal cannot be transmitted, causing the heating circuit to be disconnected. In this case, check whether the knob structure is stuck, whether the elasticity of the spring is invalid, and replace it in time.

The safety protection mechanism inside the device may also trigger a heating interruption under certain conditions. For example, some models are equipped with a thermal fuse or overheating protector. When the temperature of the device rises abnormally, the heating circuit is automatically disconnected to prevent the risk of fire. If the user uses the device without cleaning the air duct, poor heat dissipation, or blocked vents, it will cause temperature accumulation, triggering the protection mechanism, causing the device to misjudge the abnormal state and stop heating. At this time, the internal air duct and the surface of the heating element should be thoroughly cleaned to ensure that the heat is effectively dissipated, and the thermal protector should be reset or replaced. At the design level, the selection of thermal protectors needs to be combined with the maximum operating temperature of the equipment and the environmental heat load to avoid allergic or delayed action and ensure the safety and reliability of the equipment. Through comprehensive inspection and maintenance of the above factors, the efficiency and safety performance of mechanical air fryers can be effectively improved.